WO2024157805A1 - 固体電解コンデンサ - Google Patents

固体電解コンデンサ Download PDF

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Publication number
WO2024157805A1
WO2024157805A1 PCT/JP2024/000632 JP2024000632W WO2024157805A1 WO 2024157805 A1 WO2024157805 A1 WO 2024157805A1 JP 2024000632 W JP2024000632 W JP 2024000632W WO 2024157805 A1 WO2024157805 A1 WO 2024157805A1
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WO
WIPO (PCT)
Prior art keywords
cathode
electrically connected
anode
solid electrolytic
electrolytic capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2024/000632
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English (en)
French (fr)
Japanese (ja)
Inventor
周作 鯉江
健司 倉貫
幸二 高橋
浩之 半田
昇 根来
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Publication date
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Priority to JP2024572969A priority Critical patent/JPWO2024157805A1/ja
Priority to CN202480008139.2A priority patent/CN120584391A/zh
Publication of WO2024157805A1 publication Critical patent/WO2024157805A1/ja
Priority to US19/257,593 priority patent/US20250329503A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/14—Structural combinations or circuits for modifying, or compensating for, electric characteristics of electrolytic capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/008—Terminals
    • H01G9/012—Terminals specially adapted for solid capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/04—Electrodes or formation of dielectric layers thereon
    • H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/04—Electrodes or formation of dielectric layers thereon
    • H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
    • H01G9/052—Sintered electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/15—Solid electrolytic capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/022—Electrolytes; Absorbents
    • H01G9/025—Solid electrolytes
    • H01G9/028—Organic semiconducting electrolytes, e.g. TCNQ

Definitions

  • This disclosure relates to solid electrolytic capacitors.
  • Patent Document 1 Conventionally, surface-mounted capacitors known as transmission line type noise filters are known (for example, see Patent Document 1).
  • the surface-mounted capacitor in Patent Document 1 comprises a box-shaped resin molded case base, multiple capacitor elements stacked with anodes at both ends and cathodes in the center, and a box-shaped case lid, and, if necessary, further comprises a metal plate that is engaged with the inside of the case lid to compensate for the conductivity of the cathodes of the capacitor elements.
  • one of the objectives of this disclosure is to improve the noise filtering characteristics.
  • the solid electrolytic capacitor includes a plurality of capacitor elements, each of which has an anode body and a cathode part formed on the surface of the anode body via a dielectric layer, with a portion of the anode body protruding from both ends of the cathode part and stacked on top of each other, two anode terminals electrically connected to the two protruding parts of the anode body, a cathode terminal electrically connected to the cathode part, and an exterior resin that covers the plurality of capacitor elements, the anode terminal, and the cathode terminal so that a portion of each of the anode terminal and the cathode terminal is exposed, and the two protruding parts of each of the capacitor elements are electrically conductive to each other, and each of the cathode parts has a first part having a first width and a second part having a second width smaller than the first width, and the cathode terminal has
  • This disclosure makes it possible to improve noise filter characteristics.
  • FIG. 1 is a side perspective view illustrating a solid electrolytic capacitor according to a first embodiment of the present invention
  • FIG. 2 is a side cross-sectional view that typically illustrates a capacitor element.
  • FIG. 2 is a perspective view illustrating a capacitor element.
  • FIG. 11 is a side perspective view illustrating a solid electrolytic capacitor according to a second embodiment.
  • the solid electrolytic capacitor according to the present disclosure can be used as, for example, a three-terminal transmission line component having a noise filter function.
  • the solid electrolytic capacitor according to the present disclosure includes a plurality of capacitor elements, two anode terminals, a cathode terminal, and an exterior resin. Note that there may be two or more anode terminals, and one or more cathode terminals.
  • Each of the multiple capacitor elements has an anode body and a cathode portion formed on the surface of the anode body via a dielectric layer, and a part of the anode body protrudes from each of the opposing ends of the cathode portion.
  • the part of the anode body protruding from both ends of the cathode portion is also referred to as a protruding portion.
  • the multiple capacitor elements are stacked on top of each other.
  • the two protruding portions of the anode body are electrically conductive to each other.
  • Each capacitor element may further have an insulating portion provided between the anode body and the cathode portion to electrically insulate them from each other.
  • the insulating portion may be composed of, for example, insulating tape or insulating resin.
  • the anode body may be made of a valve metal.
  • the valve metal that constitutes the anode body include aluminum, tantalum, niobium, and titanium.
  • the anode body may be a valve metal foil or a sintered body of valve metal particles. Adjacent anode bodies in the stacking direction may be electrically connected to each other.
  • the dielectric layer may cover at least a portion of the surface of the anode body.
  • the dielectric layer may be composed of an oxide (e.g., aluminum oxide) formed on the surface of the anode body by a liquid phase method such as anodization, or a gas phase method such as vapor deposition or atomic layer deposition.
  • the dielectric layer is formed so as to be interposed at least between the anode body and the cathode portion.
  • the cathode part may have a solid electrolyte layer covering at least a portion of the surface of the dielectric layer, and a cathode layer covering at least a portion of the surface of the solid electrolyte layer.
  • the cathode parts adjacent to each other in the stacking direction may be electrically connected to each other.
  • the solid electrolyte layer may include a conductive polymer.
  • the solid electrolyte layer may further include a dopant, as necessary.
  • the conductive polymer may be a known one used in solid electrolytic capacitors, such as a ⁇ -conjugated conductive polymer.
  • conductive polymers include polymers having a basic skeleton of polypyrrole, polythiophene, polyaniline, polyfuran, polyacetylene, polyphenylene, polyphenylenevinylene, polyacene, and polythiophenevinylene. Of these, polymers having a basic skeleton of polypyrrole, polythiophene, or polyaniline are preferred.
  • the above polymers include homopolymers, copolymers of two or more monomers, and derivatives thereof (such as substituted products having a substituent).
  • polythiophenes include poly(3,4-ethylenedioxythiophene).
  • the conductive polymers may be used alone or in combination of two or more.
  • the dopant is, for example, at least one selected from the group consisting of low molecular weight anions and polyanions.
  • low molecular weight anions include, but are not limited to, sulfate ions, nitrate ions, phosphate ions, borate ions, organic sulfonate ions, and carboxylate ions.
  • dopants that generate organic sulfonate ions include, for example, benzenesulfonic acid, p-toluenesulfonic acid, and naphthalenesulfonic acid.
  • polyanions include, for example, polymer-type polysulfonic acids and polymer-type polycarboxylic acids.
  • polymer-type polysulfonic acids examples include polyvinylsulfonic acid, polystyrenesulfonic acid, polyallylsulfonic acid, polyacrylicsulfonic acid, and polymethacrylicsulfonic acid.
  • polymer-type polycarboxylic acids examples include polyacrylic acid and polymethacrylic acid.
  • polyanions include polyestersulfonic acid and phenolsulfonic acid novolac resin. However, the polyanions are not limited to these.
  • the solid electrolyte layer may further contain known additives and known conductive materials other than conductive polymers, as necessary.
  • conductive materials include at least one selected from the group consisting of conductive inorganic materials such as manganese dioxide and TCNQ complex salts.
  • the cathode layer may be composed of a carbon layer formed on the surface of the solid electrolyte layer and a conductor layer formed on the surface of the carbon layer.
  • the conductor layer may be composed of silver paste.
  • the silver paste for example, a composition containing silver particles and a resin component (binder resin) may be used.
  • a resin component a thermoplastic resin may be used, but it is preferable to use a thermosetting resin such as an imide resin or an epoxy resin.
  • the two anode terminals are electrically connected to the two protruding portions of the anode body, respectively.
  • one anode terminal (first anode terminal) is electrically connected to a protruding portion protruding from one end of the cathode part
  • the other anode terminal (second anode terminal) is electrically connected to a protruding portion protruding from the other end of the cathode part.
  • the first anode terminal and the second anode terminal may each be divided into two or more parts.
  • the anode terminal may be made of copper, copper alloy, aluminum, or aluminum alloy, and may be plated.
  • the first and second anode terminals may be electrically connected to the two protruding portions of each anode body of the multiple capacitor elements.
  • the anode terminal may be electrically connected to the protruding portions by crimping or by welding (e.g., laser welding or resistance welding).
  • the cathode terminal is electrically connected to the cathode portion.
  • the cathode terminal may be electrically connected to each of the cathode portions of the multiple capacitor elements.
  • the cathode terminal may be electrically connected to the cathode portion via a conductive adhesive.
  • the cathode terminal may be made of copper, a copper alloy, aluminum, or an aluminum alloy, and may be plated.
  • the constituent material of the cathode terminal may be the same as or different from the constituent material of the anode terminal.
  • the cathode terminal may be divided into two or more parts.
  • the exterior resin covers the multiple capacitor elements, the anode terminals, and the cathode terminals so that a portion of each of the anode terminals and the cathode terminals is exposed.
  • the exposed portions of each of the anode terminals and the cathode terminals function as external terminals of the solid electrolytic capacitor.
  • the exterior resin may be made of an insulating resin material.
  • the exterior resin may be a cured product of a thermosetting resin that includes, for example, an epoxy resin, and may include a filler as necessary.
  • Each of the cathode parts has a first portion having a first width and a second portion having a second width smaller than the first width.
  • the width direction of the cathode part refers to a direction perpendicular to the stacking direction of the multiple capacitor elements and perpendicular to the direction connecting the two protrusions. Therefore, when the solid electrolytic capacitor according to the present disclosure is used as a transmission line component, the width direction of the cathode part is perpendicular to the main path of the current flowing through the solid electrolytic capacitor.
  • the second portion of the cathode part constitutes a portion where the main current path narrows. It has been discovered that noise current is unlikely to pass through such a narrow portion.
  • the cathode terminal has a first side wall electrically connected to a side surface of the second portion of the cathode portion.
  • the first side wall may be electrically connected to a side surface of the second portion of each cathode portion.
  • the first side wall may be electrically connected to a side surface of the second portion of the cathode portion via a conductive adhesive. The presence of such a first side wall reduces the impedance resulting from the resistance component and inductance component of the cathode terminal, and the noise filter characteristics of the solid electrolytic capacitor may be improved.
  • the noise filter characteristics can be improved by the second portion constituting the narrow width portion and the first side wall portion electrically connected to the side surface of the second portion.
  • the first width may be W1 and the second width may be W2, and W2/W1 ⁇ 0.95 may be satisfied. Furthermore, 0.5 ⁇ W2/W1 ⁇ 0.95 may be satisfied.
  • W2/W1 ⁇ 0.95 When W2/W1 ⁇ 0.95 is satisfied, the effect of improving the noise filter characteristics by providing the second portion is fully realized.
  • W2/W1 ⁇ 0.5 When W2/W1 ⁇ 0.5 is satisfied, it is possible to obtain such an effect of improving the noise filter characteristics while avoiding the area of the capacitor element becoming too small or the capacitance of the solid electrolytic capacitor becoming too small.
  • a recess corresponding to the second portion may be formed on both side surfaces of each capacitor element.
  • a step is formed on both side surfaces of the capacitor element as a barrier against noise current flowing through the solid electrolytic capacitor. This can further improve the noise filtering characteristics of the solid electrolytic capacitor.
  • Two first sidewall portions may be provided, one for each side of the capacitor element.
  • Each of the two first sidewall portions may be housed in a recess. With this configuration, the first sidewall portions do not protrude from the side of the capacitor element, making it possible to effectively utilize the internal space of the solid electrolytic capacitor and increase its capacitance.
  • the shape of each of the two first sidewall portions is not limited, and may be composed of, for example, multiple columnar portions.
  • the cathode terminal may further have a second side wall portion electrically connected to the side surface of the first portion of the cathode section.
  • the impedance resulting from the resistance component and inductance component of the cathode terminal is further reduced, and the noise filter characteristics of the solid electrolytic capacitor can be further improved.
  • the noise filtering characteristics of the solid electrolytic capacitor can be improved by the narrow second portion and the first sidewall portion electrically connected to its side surface.
  • a solid electrolytic capacitor 10 of this embodiment includes a plurality of capacitor elements 11 (three in this example), two anode terminals 17, a cathode terminal 18, and an exterior resin 19. Note that a first side wall portion 18b, which will be described later, is indicated by a two-dot chain line in Figure 1.
  • Each of the multiple capacitor elements 11 has an anode body 12 and a cathode portion 13 formed on the surface of the anode body 12 via a dielectric layer 14, and a part of the anode body 12 protrudes from both opposing ends of the cathode portion 13 (the left and right ends in FIG. 1).
  • the part of the anode body 12 protruding from both ends of the cathode portion 13 is also referred to as a protruding portion 12a.
  • the multiple capacitor elements 11 are stacked on top of each other.
  • the two protruding portions 12a of the anode body 12 are electrically conductive to each other.
  • Each capacitor element 11 further has an insulating portion 15 provided between the anode body 12 and the cathode portion 13 to electrically insulate them from each other.
  • the anode bodies 12 are made of a foil of a valve metal (aluminum in this example), but are not limited to this. Adjacent anode bodies 12 in the stacking direction are electrically connected to each other. Thus, all the anode bodies 12 are electrically connected to each other.
  • the dielectric layer 14 covers at least a portion of the surface of the anode body 12.
  • the dielectric layer 14 is composed of an oxide (in this example, aluminum oxide) formed on the surface of the anode body 12 that has been roughened, but is not limited to this.
  • the cathode portion 13 has a solid electrolyte layer that covers at least a portion of the dielectric layer 14, and a cathode layer that covers at least a portion of the surface of the solid electrolyte layer.
  • the cathode portions 13 adjacent to each other in the stacking direction are electrically connected to each other via the conductive paste 16. Thus, all of the cathode portions 13 are electrically connected to each other.
  • the solid electrolyte layer contains a conductive polymer and a dopant.
  • the cathode layer is composed of a carbon layer formed on the surface of the solid electrolyte layer and a conductor layer formed on the surface of the carbon layer.
  • the conductor layer may be composed of silver paste.
  • the two anode terminals 17 are electrically connected to the two protruding portions 12a of the anode body 12, respectively.
  • the anode terminals 17 are made of a copper alloy, but are not limited to this.
  • the anode terminals 17 are electrically connected to the protruding portions 12a by crimping. Note that instead of or in addition to crimping, the anode terminals 17 may be welded to the protruding portions 12a.
  • the cathode terminal 18 is electrically connected to the cathode portion 13, for example, via a conductive adhesive.
  • the cathode terminal 18 is made of a copper alloy, but is not limited to this.
  • the material of the cathode terminal 18 is the same as the material of the anode terminal 17.
  • the exterior resin 19 covers the multiple capacitor elements 11, the anode terminals 17, and the cathode terminals 18 so that a portion of each of the anode terminals 17 and the cathode terminals 18 is exposed.
  • the exposed portions of each of the anode terminals 17 and the cathode terminals 18 function as external terminals of the solid electrolytic capacitor 10.
  • the exterior resin 19 is made of an insulating resin material that contains a filler.
  • Each of the cathode parts 13 has a first part 13a having a first width and a second part 13b having a second width smaller than the first width.
  • the second part 13b is preferably disposed in the center of the cathode part 13 in the longitudinal direction of the cathode part 13 (the direction that coincides with the direction connecting the two protrusions 12a).
  • Two first parts 13a may be provided so as to sandwich the second part 13b in the longitudinal direction of the cathode part 13.
  • the first width is W1 and the second width is W2, it is preferable that W2/W1 ⁇ 0.95 holds, and it is even more preferable that 0.5 ⁇ W2/W1 ⁇ 0.95 holds.
  • a recess 11a corresponding to the second portion 13b is formed on both side surfaces of each capacitor element 11. It is preferable that the shape of the recess 11a is rectangular or trapezoidal (particularly a trapezoid that narrows toward the center of the capacitor element 11 in the width direction) when viewed from the stacking direction of the multiple capacitor elements 11. Note that Figure 3 shows a capacitor element 11 in which a rectangular recess 11a is formed.
  • the cathode terminal 18 has a mounting surface portion 18a exposed from the exterior resin 19, and a first sidewall portion 18b that rises continuously from the mounting surface portion 18a and is electrically connected to the side of the second portion 13b of each cathode portion 13.
  • the mounting surface portion 18a is electrically connected to the cathode portion 13 of the capacitor element 11 that is closest to it (the lowest in FIG. 1).
  • the first sidewall portion 18b is electrically connected to the side of the second portion 13b of each cathode portion 13 via a conductive adhesive (not shown).
  • the first sidewall portion 18b may be housed in the recess 11a.
  • Solid electrolytic capacitor 10 of the present embodiment differs from the first embodiment in that solid electrolytic capacitor 10 includes second sidewall portion 18c. The following mainly describes the differences from the first embodiment.
  • the cathode terminal 18 has a second side wall portion 18c that rises continuously from the mounting surface portion 18a and is electrically connected to the side surface of the first portion 13a of each cathode portion 13.
  • the width of the second side wall portion 18c (the left-right dimension in FIG. 4) may be smaller or larger than the width of the first side wall portion 18b, or may be the same as the width of the first side wall portion 18b.
  • the characteristics of the solid electrolytic capacitors 10 of the examples and comparative examples shown below were evaluated. Specifically, the amount of noise suppression when a 100 MHz noise signal was input from one anode terminal 17 to the other anode terminal 17 was evaluated for the solid electrolytic capacitors 10 of the examples and comparative examples.
  • Example The solid electrolytic capacitor 10 of the type shown in the above-mentioned embodiment 1 was evaluated.
  • the noise suppression amount was ⁇ 120 dB.
  • the noise level was 25% when the noise level of the comparative solid electrolytic capacitor was set to 100%.
  • Comparative Example A solid electrolytic capacitor having the same configuration as the solid electrolytic capacitor 10 of the example was evaluated, except that the cathode portion 13 did not have the second portion 13b.
  • the width of the cathode portion 13 was constant and was set to the same width as the second portion 13b of the solid electrolytic capacitor 10 of the example.
  • the noise suppression amount was ⁇ 108 dB.
  • the solid electrolytic capacitor 10 of the embodiment had a significantly higher noise suppression amount than the solid electrolytic capacitor of the comparative example. Therefore, it can be said that the superiority of the embodiment is demonstrated.
  • This disclosure can be used in solid electrolytic capacitors.
  • Solid electrolytic capacitor 11 Capacitor element 11a: Recess 12: Anode body 12a: Protrusion 13: Cathode portion 13a: First portion 13b: Second portion 14: Dielectric layer 15: Insulating portion 16: Conductive paste 17: Anode terminal 18: Cathode terminal 18a: Mounting surface portion 18b: First side wall portion 18c: Second side wall portion 19: Exterior resin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
PCT/JP2024/000632 2023-01-24 2024-01-12 固体電解コンデンサ Ceased WO2024157805A1 (ja)

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JP2024572969A JPWO2024157805A1 (https=) 2023-01-24 2024-01-12
CN202480008139.2A CN120584391A (zh) 2023-01-24 2024-01-12 固体电解电容器
US19/257,593 US20250329503A1 (en) 2023-01-24 2025-07-02 Solid electrolytic capacitor

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JP2023008713 2023-01-24
JP2023-008713 2023-01-24

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009010067A (ja) * 2007-06-27 2009-01-15 Panasonic Corp チップ形固体電解コンデンサ
JP2009253020A (ja) * 2008-04-07 2009-10-29 Nec Tokin Corp 固体電解コンデンサ
JP2011035057A (ja) * 2009-07-30 2011-02-17 Nichicon Corp 積層型固体電解コンデンサ
WO2012140836A1 (ja) * 2011-04-14 2012-10-18 パナソニック株式会社 電解コンデンサ
WO2021172236A1 (ja) * 2020-02-28 2021-09-02 パナソニックＩｐマネジメント株式会社 電解コンデンサおよびその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009010067A (ja) * 2007-06-27 2009-01-15 Panasonic Corp チップ形固体電解コンデンサ
JP2009253020A (ja) * 2008-04-07 2009-10-29 Nec Tokin Corp 固体電解コンデンサ
JP2011035057A (ja) * 2009-07-30 2011-02-17 Nichicon Corp 積層型固体電解コンデンサ
WO2012140836A1 (ja) * 2011-04-14 2012-10-18 パナソニック株式会社 電解コンデンサ
WO2021172236A1 (ja) * 2020-02-28 2021-09-02 パナソニックＩｐマネジメント株式会社 電解コンデンサおよびその製造方法

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JPWO2024157805A1 (https=) 2024-08-02
US20250329503A1 (en) 2025-10-23

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